I assume it is(was) a 150. The original red is Lechler code 8073.
Are you spraying all of the scooter or just part? Paint fades and any part only spraying will probably stand out like a sore thumb, especially red.
If you are only spraying part take a piece of the scooter and get it colour matched at a specialist.
Don' t know where you live but I have used these guys near Bolton. Very good.
http://www.paintproblems.co.uk/